When I try to get a negative value on a face morph of a Poser Figure (D3) in C6, the value doesn't work or better, will be set back to zero again. 
Though it seems that the negative morphs will be accepted if I load them as a pre-set face pose from Poser.
Is there a workaround to get the negative values to work when applying them manually?

Thanks a lot for your help, it's highly appreciated!

~Sassy~